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Tom Lane 45811be94e Fix postmaster's handling of a startup-process crash. Ordinarily, a failure (unexpected exit status) of the startup subprocess should be considered fatal, so the postmaster should just close up shop and quit. However, if we sent the startup process a SIGQUIT or SIGKILL signal, the failure is hardly "unexpected", and we should attempt restart; this is necessary for recovery from ordinary backend crashes in hot-standby scenarios. I attempted to implement the latter rule with a two-line patch in commit `442231d7f7`, but it now emerges that that patch was a few bricks shy of a load: it failed to distinguish the case of a signaled startup process from the case where the new startup process crashes before reaching database consistency. That resulted in infinitely respawning a new startup process only to have it crash again. To handle this properly, we really must track whether we have sent the current startup process a kill signal. Rather than add yet another ad-hoc boolean to the postmaster's state, I chose to unify this with the existing RecoveryError flag into an enum tracking the startup process's state. That seems more consistent with the postmaster's general state machine design. Back-patch to 9.0, like the previous patch.		2015-07-09 13:22:22 -04:00
config	Replace our hacked version of ax_pthread.m4 with latest upstream version.	2015-07-08 20:36:06 +03:00
contrib	Link pg_stat_statements with libm.	2015-07-08 20:44:22 -04:00
doc	Make wal_compression PGC_SUSET rather than PGC_USERSET.	2015-07-09 22:30:52 +09:00
src	Fix postmaster's handling of a startup-process crash.	2015-07-09 13:22:22 -04:00
.dir-locals.el	emacs: Set indent-tabs-mode in perl-mode	2015-04-12 23:53:23 -04:00
.gitattributes	Add functions for dealing with PGP armor header lines to pgcrypto.	2014-10-01 16:03:39 +03:00
.gitignore	Add .gitignore entries for AIX-specific intermediate build artifacts.	2015-07-08 20:44:22 -04:00
COPYRIGHT	Update copyright for 2015	2015-01-06 11:43:47 -05:00
GNUmakefile.in	Fix distclean/maintainer-clean targets to remove top-level tmp_install dir.	2015-05-13 18:48:05 -04:00
HISTORY	Improve text of stub HISTORY file.	2014-02-12 18:16:17 -05:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
README	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
README.git	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
aclocal.m4	Replace our hacked version of ax_pthread.m4 with latest upstream version.	2015-07-08 20:36:06 +03:00
configure	Use AS_IF rather than plain shell "if" in pthread-check.	2015-07-09 11:38:34 +03:00
configure.in	Use AS_IF rather than plain shell "if" in pthread-check.	2015-07-09 11:38:34 +03:00

README

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.